CN100464578C - System and method for high-quality variable speed playback of audio-visual media - Google Patents
System and method for high-quality variable speed playback of audio-visual media Download PDFInfo
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- CN100464578C CN100464578C CNB2005100725488A CN200510072548A CN100464578C CN 100464578 C CN100464578 C CN 100464578C CN B2005100725488 A CNB2005100725488 A CN B2005100725488A CN 200510072548 A CN200510072548 A CN 200510072548A CN 100464578 C CN100464578 C CN 100464578C
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00007—Time or data compression or expansion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
- H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
Abstract
A system and method for high-quality variable speed playback of audio-visual (A/V) media is provided. The system receives an encoded visual signal and an encoded audio signal. The encoded visual signal is decoded to generate a decoded visual signal and the encoded audio signal is decoded to generate a decoded audio signal. The decoded audio signal is time scale modified to generate a time scale modified audio signal. The decoded visual signal and the time scale modified audio signal are then synchronized for playback at a predefined playback speed. Only partial decoding of the encoded audio signal may be performed to conserve processing power.
Description
Technical field
The present invention relates to the decoding and the broadcast of audiovisual (A/V) medium.
Background technology
The system that tradition is used for playback of audio-visual (A/V) medium comprises analogue system (for example video tape recorder (VCR)) and such as the digital system of DVD player, personal video recorder (PVR), set-top box and PC (PC).Many legacy systems include and make the user with F.F. or move the image section function that play mode is play the A/V medium slowly.In the operating process of these patterns, audio-frequency unit is closed usually fully.In other words, in F.F. or move slowly in the play mode, allow the user to see F.F. or move the image section of broadcast slowly, but can not hear audio-frequency unit fully.The user sees that from user perspective this does not conform to demand, because may be desirably in fast or hear during the slow play audio-frequency unit of A/V medium.
Referring now to Fig. 1 and 2 this principle is shown.Fig. 1 is depicted as the legacy system that is used to play the A/V medium how to operate functional block Figure 100 to play in normal speed.As using in this article, " normally " expression A/V medium are not in F.F. or move play mode slowly.Fig. 2 is depicted as the functional block Figure 200 how legacy system is operated under F.F. or slow mode shifter.Fig. 1 and Fig. 2 generally are applicable to the analog-and digital-system of statement, and the system of single channel audio signal and multi channel audio signal is handled in statement.
As shown in Figure 1, the broadcast of normal speed relates to functional block 102,104,106 and 108.At piece 102, the A/V signal of legacy system received code also is split as the audio signal of encoded image signal and coding with it.At piece 104, legacy system is decoded encoded image signal with normal speed, to generate decoded image signal.At piece 106, legacy system is with the audio signal decoding of normal speed with coding, to generate the audio signal of decoding.At piece 108, legacy system is decoded image signal and audio signal mutually synchronization mutually, and the most at last he they with normal speed forward.
As shown in Figure 2, quick or slow play only relates to functional block 202,204 and 206.At piece 202, the A/V signal of legacy system received code and the encoded image signal of therefrom extracting.At piece 204, legacy system is doubly decoded to encoded image signal with the X of normal speed, and wherein X is the predefined multiplier of normal decoder/broadcast.When wanting to play fast, X is greater than 1; And when wanting slow play, X is less than 1.Therefore, for example during X=0.5, will make broadcasting speed reduce half; And when X=2, broadcasting speed is 2 times of normal speed.At piece 206, legacy system is then with the picture signal of speed multiple X broadcast decoder of expectation.
As shown in Figure 2, the F.F. in the legacy system or move broadcast slowly any voice playing is not provided usually.This may be because in fast-forward mode, and the speed that must make data decode increases with respect to the speed of fast-forward functionality.Like this, if broadcasting speed improves 1 times, then the decode rate of image and voice data must double; If broadcasting speed improves 2 times, then the decode rate of image and voice data must become 3 times of former normal speed; The rest may be inferred.Therefore, must use extra processing power to satisfy the code requirement of separating of these increases.When audio signal be the multichannel coded audio (such as Dolby Digital (Dolby Digital) (AC-3) or the MPEG multi-channel audio) time, system must comprise the processing of a large amount of extra process power with acceleration that all voice-grade channels are provided.These demands that are used for the increase of processing power have caused implementing to play the cost increase of A/V media system.
Another difficult point of attempting to occur in the audio plays in F.F. or slow mode shifter is under the situation that still obtains the high quality audio result of broadcast that audio signal and picture signal is synchronous.For example, the broadcasting speed that increases or reduce audio-frequency unit simply will influence the tone color and the tone of audio frequency with the broadcasting speed of matching image part, thereby make human speech can have the tone of in alt similar " chipmuck ", and have the tone of similar " sleeping giant " of low pitch at slow mode shifter at fast-forward mode.
Therefore expectation provides a kind of system of the A/V of broadcast medium, when F.F. or slow mode shifter audio-frequency unit is play together in company with image section in this system.Also expectation provides such system, and wherein the audio-frequency unit in F.F. or slow mode shifter has high-quality, thereby does not change the tone color and the tone of human speech.Also expectation provides such system, wherein will and carry out the required processing power of other processing to audio signal decoding when F.F. or slow play pattern and minimize, and preferably be no more than the required processing power of audio signal when normal playback speed.
Summary of the invention
The present invention relates to a kind of system and method that the high-quality variable bit rate is play the A/V medium that is used for.One embodiment of the present of invention are together play the audio-frequency unit of A/V medium with the image section of A/V medium under F.F. or slow mode shifter.In one embodiment, used the markers correction to guarantee having high-quality in F.F. or the audio-frequency unit play under the Move Mode at a slow speed.In a further embodiment, only the part of audio signal of coding is decoded, with F.F. or during moving slowly to audio signal decoding and carry out other and handle required processing power and minimize.In yet another embodiment, during F.F. or slow mode shifter to audio signal decoding and carry out other and handle required processing power and be no more than with the required power of normal playback speed audio signal.
Especially, one embodiment of the present of invention provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed.According to this method, encoded image signal is received, and the audio signal of coding also is received.The audio signal of coding comprises the information corresponding to a plurality of voice-grade channels.Encoded image signal is decoded to generate decoded image signal.The audio signal of coding is decoded to generate the audio signal of decoding, and only wherein the audio signal decoding of coding being comprised will be corresponding to the information decoding of the subclass of a plurality of voice-grade channels.Then the audio signal of decoding is carried out the markers correction, to generate markers correction audio signal.At last, the audio signal of decoded image signal and markers correction is synchronous, thus play at predetermined broadcasting speed.
In an alternative embodiment of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed.According to this method, encoded image signal is received, and the audio signal of coding also is received.The audio signal of coding comprises the information corresponding to a plurality of frequency parts.Encoded image signal is decoded to generate decoded image signal.With the audio signal that the audio signal decoding of coding is decoded with generation, wherein the audio signal decoding of encoding being comprised only will be corresponding to the information decoding in the coding audio signal of a plurality of frequencies subclass partly.Then the audio signal of decoding is carried out the markers correction, to generate markers correction audio signal.At last, the audio signal of decoded image signal and markers correction is synchronous, thus play at predetermined broadcasting speed.
In another alternative embodiment of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed.According to this method, encoded image signal is received, and the audio signal of coding also is received.Encoded image signal is decoded to generate decoded image signal.With the audio signal decoding of coding to generate the audio signal of decoding.Then the audio signal of decoding is carried out the markers correction to generate the audio signal of markers correction.At last, the audio signal of decoded image signal and markers correction is synchronous, thus play at predetermined broadcasting speed.
In another alternative embodiment of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed.According to this method, encoded image signal is received, and the audio signal of coding also is received.Encoded image signal is decoded to generate decoded image signal.With the audio signal decoding of coding and carry out the markers correction to generate the audio signal of markers correction.At last, the audio signal of decoded image signal and markers correction is synchronous, thus play at predetermined broadcasting speed.
One embodiment of the present of invention provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed.This system comprises the device of the audio signal of the device of picture signal of received code and received code.The audio signal of coding comprises the information corresponding to a plurality of voice-grade channels.This system also comprises the encoded image signal decoding to generate the device of decoded image signal, and with the audio signal decoding of the coding device with the audio signal that generates decoding, only wherein the device of the audio signal decoding of coding being comprised will be corresponding to the device of the information decoding in the coding audio signal of the subclass of a plurality of voice-grade channels.This system further comprises the audio signal of decoding carried out the markers correction generating the device of markers correction audio signal, thus and the device that the audio signal of decoded image signal and markers correction is play at predetermined broadcasting speed synchronously.
In an alternate embodiment of the invention, also provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed.This system comprises the device of the audio signal of the device of picture signal of received code and received code.The audio signal of coding comprises the information corresponding to a plurality of frequency parts.This system also comprises the encoded image signal decoding to generate the device of decoded image signal, and with the audio signal decoding of the coding device with the audio signal that generates decoding, only wherein the device of the audio signal decoding of coding being comprised will be corresponding to the device of the information decoding in the coding audio signal of the subclass of a plurality of frequencies parts.This system further comprises the audio signal of decoding carried out the markers correction generating the device of markers correction audio signal, thus and the device that the audio signal of decoded image signal and markers correction is play at predetermined broadcasting speed synchronously.
In another alternative embodiment of the present invention, also provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed.This system comprises the device of the audio signal of the device of picture signal of received code and received code.This system also comprises encoded image signal decoding generating the device of decoded image signal, and with the audio signal decoding of the coding device with the audio signal that generates decoding.This system further comprises the audio signal of decoding carried out the markers correction generating the device of markers correction audio signal, thus and the device that the audio signal of decoded image signal and markers correction is play at predetermined broadcasting speed synchronously.
In another alternative embodiment of the present invention, also provide a kind of system that is used to handle the A/N medium of playing with predetermined broadcasting speed.This system comprises the device of the audio signal of the device of picture signal of received code and received code.This system also comprises encoded image signal decoding generating the device of decoded image signal, and with audio signal decoding and carry out the markers correction to generate the device of markers correction audio signal.Thereby this system further comprises the device that the audio signal of decoded image signal and markers correction is play at predetermined broadcasting speed synchronously.
According to an aspect of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The picture signal of received code;
The audio signal of received code; The audio signal of this coding comprises the information corresponding to a plurality of voice-grade channels;
Encoded image signal is decoded to generate decoded image signal;
To generate the audio signal of decoding, only wherein the audio signal decoding of coding being comprised will be corresponding to the information decoding in the audio signal of the coding of part voice-grade channel with the audio signal decoding of coding;
The audio signal of decoding is carried out the markers correction, to generate markers correction audio signal;
And the audio signal of decoded image signal and markers correction is synchronous, thereby play at predetermined broadcasting speed.
Preferably, this method further comprises:
Receive the coded audio-picture signal that merges;
And the audio signal that the coded audio-picture signal that merges is split as encoded image signal and coding.
Preferably, this image encoded and audio signal are digital signal.
Preferably, this image encoded and audio signal are analog signal.
Preferably, this method comprises that also the audio signal with coding is a digital signal from analog signal conversion.
Preferably, the quantity of the channel in the subclass of a plurality of voice-grade channels is determined based on predetermined broadcasting speed.
Preferably, comprise information corresponding to the information of a plurality of voice-grade channels, wherein the audio signal decoding of coding is only comprised and will decode corresponding to the information of the subclass of the part of the frequency in each subclass channel of a plurality of voice-grade channels with the audio signal that generates decoding corresponding to a plurality of frequencies parts of each channel in a plurality of voice-grade channels.
According to an aspect of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The picture signal of received code;
The audio signal of received code, the audio signal of this coding comprise the information corresponding to a plurality of frequency parts;
Encoded image signal is decoded to generate decoded image signal;
With the audio signal that the audio signal decoding of coding is decoded with generation, wherein the audio signal decoding of encoding being comprised only will be corresponding to the information decoding in the coding audio signal of component frequency;
The audio signal of decoding is carried out the markers correction, to generate markers correction audio signal;
And the audio signal of decoded image signal and markers correction is synchronous, thereby play at predetermined broadcasting speed.
Preferably, this method further comprises:
Receive the coded audio-picture signal that merges;
And the audio signal that the coded audio-picture signal that merges is split as encoded image signal and coding.
Preferably, this image encoded and audio signal are digital signal.
Preferably, this image encoded and audio signal are analog signal.
Preferably, this method comprises that also the audio signal with coding is a digital signal from analog signal conversion.
Preferably, the frequency partial amt in the subclass of a plurality of frequency parts is determined based on predetermined broadcasting speed.
According to an aspect of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The picture signal of received code;
The audio signal of received code;
Encoded image signal is decoded to generate decoded image signal;
The audio signal parts of coding is decoded to generate the audio signal of decoding;
The audio signal of decoding is carried out the markers correction to generate the audio signal of markers correction;
And the audio signal of decoded image signal and markers correction is synchronous, thereby play at predetermined broadcasting speed.
According to an aspect of the present invention, provide a kind of method that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The picture signal of received code;
The audio signal of received code;
Encoded image signal is decoded to generate decoded image signal;
With the audio signal parts decoding of coding and carry out the markers correction to generate the audio signal of markers correction;
And the audio signal of decoded image signal and markers correction is synchronous, thereby play at predetermined broadcasting speed.
According to an aspect of the present invention, provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed, this system comprises:
The device of the picture signal of received code;
The device of the audio signal of received code, the audio signal of coding comprises the information corresponding to a plurality of voice-grade channels;
With the device of encoded image signal decoding with the generation decoded image signal;
With the audio signal decoding of the coding device with the audio signal that generates decoding, wherein the audio signal decoding of coding being comprised with the device of the audio signal that generates decoding only will be corresponding to the device of the information decoding in the coding audio signal of part voice-grade channel;
The audio signal of decoding is carried out the markers correction to generate the device of markers correction audio signal;
Thereby and with the synchronous device of playing at predetermined broadcasting speed of the audio signal of decoded image signal and markers correction.
Preferably, this system also comprises:
Receive the device of the coded audio-picture signal that merges;
And the device that the coded audio-picture signal that merges is split as the audio signal of encoded image signal and coding.
Preferably, this image encoded and audio signal are digital signal.
Preferably, this image encoded and audio signal are analog signal.
Preferably, this system comprises that also the audio signal with coding is the device of digital signal from analog signal conversion.
Preferably, the quantity of the channel in the subclass of a plurality of voice-grade channels is determined based on predetermined broadcasting speed.
Preferably, comprise information corresponding to the information of a plurality of voice-grade channels, wherein the audio signal decoding of coding is only comprised and will decode corresponding to the information of the subclass of the part of the frequency in each subclass channel of a plurality of voice-grade channels with the audio signal that generates decoding corresponding to a plurality of frequencies parts of each channel in a plurality of voice-grade channels.
According to an aspect of the present invention, also provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The device of the picture signal of received code;
The device of the audio signal of received code, the audio signal of coding comprise the information corresponding to a plurality of frequency parts;
With the device of encoded image signal decoding with the generation decoded image signal;
With the audio signal decoding of the coding device with the audio signal that generates decoding, wherein the audio signal decoding of coding being comprised with the device of the audio signal that generates decoding only will be corresponding to the device of the information decoding in the coding audio signal of component frequency;
The audio signal of decoding is carried out the markers correction to generate the device of markers correction audio signal;
Thereby and with the synchronous device of playing at predetermined broadcasting speed of the audio signal of decoded image signal and markers correction.
Preferably, this system also comprises:
Receive the device of the coded audio-picture signal that merges;
And the device that the coded audio-picture signal that merges is split as the audio signal of encoded image signal and coding.
Preferably, this image encoded and audio signal are digital signal.
Preferably, this image encoded and audio signal are analog signal.
Preferably, this system comprises that also the audio signal with coding is the device of digital signal from analog signal conversion.
Preferably, the quantity of the frequency part in the subclass of a plurality of frequency parts is determined based on predetermined broadcasting speed.
According to an aspect of the present invention, also provide a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed, having comprised:
The device of the picture signal of received code;
The device of the audio signal of received code;
With the device of encoded image signal decoding with the generation decoded image signal;
The audio signal parts of coding is decoded to generate the device of the audio signal of decoding;
The audio signal of decoding is carried out the markers correction to generate the device of markers correction audio signal;
Thereby and with the synchronous device of playing at predetermined broadcasting speed of the audio signal of decoded image signal and markers correction.
According to a fermentation of the present invention, a kind of system that is used to handle the A/V medium of playing with predetermined broadcasting speed also is provided, comprising:
The device of the picture signal of received code;
The device of the audio signal of received code;
With the device of encoded image signal decoding with the generation decoded image signal;
With audio signal parts decoding and carry out the markers correction to generate the device of markers correction audio signal;
Thereby and with the synchronous device of playing at predetermined broadcasting speed of the audio signal of decoded image signal and markers correction.
Further feature and advantage of the present invention, and the structure of various embodiments of the present invention will be with reference to the accompanying drawings in following detailed description with operation.It should be noted that the present invention is not limited to specific embodiment described herein.These embodiment only are used for the example purpose herein.Those skilled in the art will know other embodiment of the present invention after based on professor herein.
Description of drawings
Herein in conjunction with and as an illustration the accompanying drawing of a book part show the present invention, and further illustrate principle of the present invention, thereby to make those skilled in the art can put into practice and use the present invention with describing.
Fig. 1 is a functional block diagram, shows traditional being used to and plays the system of A/V medium and how to realize normal speed forward.
Fig. 2 is a functional block diagram, shows system that traditional being used to play the A/V medium how in F.F. or move manipulate slowly.
Fig. 3 is the functional block diagram that is used for playing at F.F. or slow mode shifter the system of A/V medium according to the first embodiment of the present invention.
Fig. 4 is the functional block diagram that is used for playing at F.F. or slow mode shifter the system of A/V medium according to a second embodiment of the present invention.
By the detailed description below in conjunction with accompanying drawing, it is clearer that the features and advantages of the present invention will become, and identical in the accompanying drawings referenced characteristics is represented all corresponding components.In the drawings, same reference numbering ordinary representation function class like and/or the parts of similar.The figure that parts occur for the first time is by the numeral of the corresponding reference numerals leftmost side.
Embodiment
The F.F. of A/V medium A. according to an embodiment of the invention/move slowly broadcast
Fig. 3 is the functional block diagram 300 that is used for playing at F.F. or slow mode shifter the system of A/V medium according to the first embodiment of the present invention.Can be understood that as those skilled in the art each functional module of Figure 30 0 all can be easily realized by the combination of hardware, software or hardware and software based on professor provided herein.The arrangement and the definition that it shall yet further be noted that functional module among Figure 30 0 are intended to pass on notion, and do not mean that the present invention is limited to specific execution mode.The embodiment that describes with reference to figure 3 can be used as the part of the equipment of any broadcast A/V medium or device (including but not limited to VCR, DVD player, PVR, set-top box or PC) and implements.
As shown in Figure 3, flow process starts from piece 302, and the A/V signal of system's received code also is split as the audio signal of encoded image signal and coding with it.The A/V signal of coding can read from local medium (for example VHS tape, DVD or hard disk drive), perhaps receives from remote location by network (for example cable and/or fiber broadband communication network).
At piece 304, with the decoded image signal of encoded image signal decoding with X times of speed of generation, wherein X is the predetermined multiplier of normal decoder/playback rate with X times of speed in system.When expectation was play fast, X was greater than 1; When the needs slow play, X is less than 1.Technology at the picture signal of quick or slow play decoding and coding is the known technology of this area, and suitable technology can be used for realizing the function of piece 304 arbitrarily.For example, handle in the encoded image signal technology at quick broadcast at some, picture frame is dropped.As another example, to handle in the encoded image signal technology at slow play at some, the picture frame of equal number is decoded with broadcast, but they play long period of time.Yet, it should be noted that the present invention is not limited to any specific technology of decoding at quick or slow play and to encoded image signal.
At piece 306, system provides normal decoder for the audio signal of coding.As used in this article, the audio signal decoding mode of the coding that adopted of " normally " expression identical with the speed of normal play A/V medium (promptly be not F.F. and move broadcast slowly).
According to embodiments of the invention, the audio signal of coding can comprise analog signal or digital signal.The audio signal of coding also can comprise single (list) channel audio signal and multi channel audio signal.According to embodiments of the invention, the example of the single channel audio format that can support includes but not limited to have the vhs video band of single audio frequency.According to embodiments of the invention, the example of the multi-channel audio form that can support includes but not limited to that clear stereo vhs video band, Dolby Surround, Dolby Digital 5.1, Dolby Digital EX, DTS digital rings are around, DTS ES6.1 or MPEG multi-channel audio.
In step 308, system carries out the X times broadcasting speed of markers correction with the coupling audio signal to the audio signal of normal decoder.The markers correction refers to be used to change the various technology that audio signal continues duration when the frequency content of stick signal this locality.The purpose of markers correction is to improve or reduce the perception playback rate of the audio signal of record, and tone color, tone or the fidelity of primary signal do not had obviously influence.A variety of known markers correction techniques are arranged, and be that a suitable algorithm of given application choice relates to design alternative.It should be noted that the present invention is not limited to any specific markers correction technique.
In step 310, realize that system is synchronous with the audio signal of decoded image signal and markers correction, and they are play with X times of speed after the markers correction.Like this, according to one embodiment of present invention, watch the user of A/V medium will also can hear the audio frequency of high-quality, markers correction in F.F. or slow mode shifter, the picture signal of its sound intermediate frequency and acceleration or the broadcast of slowing down is synchronous.
With respect to system's (broadcast of omitting audio-frequency unit under these operator schemes fully usually) of tradition broadcast A/V medium, the present invention embodiment described above plays the audio-frequency unit of markers correction during F.F. or slow mode shifter, have significant advantage.But it should be noted that the embodiment that describes with reference to figure 3 perhaps needs extra processing power with respect to existing system, with in F.F. or during moving play mode slowly with audio signal decoding with carry out the markers correction.The demand of the processing power of these increases is converted into the increase of the cost when playing the realization of A/V media system.
B. use part audio decoder according to an embodiment of the invention comes F.F./move slowly to play the A/V medium
Fig. 4 is the functional block diagram 400 that is used for playing at F.F. or slow mode shifter the system of A/V medium according to a second embodiment of the present invention.This second embodiment intention to audio signal decoding with carry out other when handling, minimizes required processing power during F.F. or slow mode shifter.In fact, this embodiment can be used for the processing power of audio signal during F.F. or slow mode shifter is minimized, thereby required processing power is no more than with the required power of normal playback speed decoded audio.As described in detail in the following, the embodiment of Fig. 4 saves processing power by the audio signal of the coding of decoded portion only.
Personnel are intelligible based on professor provided herein as the present technique field, each functional block of Figure 40 0 can be easily combination by hardware, software or hardware and software realize.The arrangement and the definition that it shall yet further be noted that functional block among Figure 40 0 are intended to pass on notion, and do not mean the present invention is limited to specific execution mode.The embodiment that describes with reference to figure 4 can be used as the part of the equipment of any broadcast A/V medium or device (including but not limited to VCR, DVD player, PVR, set-top box or PC) and implements.
As shown in Figure 4, flow process starts from piece 402, and the A/V signal of system's received code also is split as the audio signal of encoded image signal and coding with it.At piece 404, with the decoded image signal of encoded image signal decoding with X times of speed of generation, wherein X is the predetermined multiplier of normal decoder/playback rate with X times of speed in system.When expectation was play fast, X was greater than 1; When the needs slow play, X is less than 1.At quick or slow play and the technology of the picture signal of decoding and coding is the known technology of this area, suitable technology can be used for realizing the function of piece 404 arbitrarily.It should be noted that the present invention is not limited to any specific technology of decoding at quick or slow play and to encoded image signal.
In step 406, the audio signal of partial decoding of h coding only.According to embodiments of the invention, partial decoding of h comprises: (1) local channel decoding, and wherein only the subclass of a plurality of channels in the multichannel coding audio signal is decoded; (2) part bandwidth decoding, wherein only the subclass of a plurality of frequencies parts in the coding audio signal is decoded; Perhaps (3) local channel/bandwidth decoding, wherein only the subclass of a plurality of channels of multichannel coding audio signal is decoded, and only the subclass of the frequency part in these channels is decoded.Yet these examples are not intended to limit the present invention, and the present invention can comprise the additive method of the audio signal of partial decoding of h coding.
The local channel decoding has following advantage: although multi-channel audio is provided, only need the subclass of these channels is decoded, during F.F. or slow mode shifter suitable voice playing is offered the user.Like this, for example, the audio signal of coding is when having Dolby Digital 5.0 signals of 5 voice-grade channels altogether, for the broadcast during F.F. or the slow mode shifter, can only decode to two voice-grade channels.For example, only to right front and left front channel-decoding.Although the user can not all 5 voice-grade channels of uppick in F.F. or during moving slowly, he or she still can hear audio-frequency unit, and can significantly save processing power by the subclass of decoded audio channel only.
For example, can expect, 2 channels in 5 channel audio signals of in 2 times of fast fast-forward modes, only decoding, the processing power that needs is suitable with the required power of four voice-grade channels of decoding in normal play mode.This means, in having the system of enough processing powers, during 2 times of fast-forward modes, be actually the processing power of having saved the voice-grade channel that equals to decode with decoding 5 voice-grade channels in normal play mode.The processing power of being saved can be used for the audio signal of partial decoding of h is carried out the markers correction, as will be discussed in more detail below.
As another example, in 5 channel audio signals only a channel can in 4 times of fast-forward modes, decode.For example, only center channel can be decoded.What can expect is, has in the system of enough processing powers of decoding 5 voice-grade channels in normal play mode, and this also can save the processing power that equals to be used for a voice-grade channel of decode system.Again, the processing power of being saved can be used to the audio signal of partial decoding of h is carried out the markers correction.
The decoding of part bandwidth has the following advantages: many conventional audio encoder frequencies of utilization territory method is handled the audio signal (in general being that 20Hz is to 20KHz) of full frequency band, this frequency domain method is a frequency domain with conversion of signals, and the signal encoding after will changing then is a plurality of different frequency parts.Yet the subclass of these frequencies parts that only need to decode is being that the user provides suitable audio to play during F.F. or slow mode shifter.For example, one embodiment of the present of invention are only decoded the frequency part that is lower than 10KHz and are ignored any 10KHz of being higher than part, rather than decoding all frequency parts from 20Hz to 20KHz.Can expect, ignore and be higher than 10KHz frequency part and will minimize user's sense of hearing influence; Yet, but can significantly save processing power.Therefore according to an exemplary embodiment of the present invention, only with the base band of coding audio signal or low-band frequency partial decoding of h under F.F. or slow mode shifter, to play.
Local channel/bandwidth decoding is with local channel decoding and part bandwidth decoding combination, to save more processing power.According to local channel/bandwidth decoding, the subclass of a plurality of channels in the multichannel coding audio signal of only decoding, the subclass of a plurality of frequency parts in each subclass channel of only decoding then.
In one embodiment, the quantity of the channel of coding audio signal to be decoded and/or frequency part depends on the playback rate of expectation.For example, in one embodiment, the decoded channel of 2 times of fast fast-forward modes and/or frequency partly than the decoded channel of 4 times of fast fast-forward modes and/the frequency part is many.The prerequisite of this example is than lacking at 4 times of fast fast-forward mode interface power demands at 2 times of required processing powers of fast fast-forward mode decoded audio signal.Therefore, can obtain more multiprocessing power with extra channel and/or the frequency part of decoding at 2 times of fast fast-forward modes.
After the audio signal of encoding was by partial decoding of h, system carried out the markers correction with X times of speed to the audio signal of partial decoding of h, shown in piece 408.As discussed in reference to Figure 3, the markers correction refers to be used to change the various technology that audio signal continues duration when the frequency content of stick signal this locality, its objective is the perception playback rate that improves or reduce the audio signal of record, and tone color, tone or the fidelity of primary signal do not had obviously influence.A variety of known markers correction techniques are arranged, and be that a suitable algorithm of given application choice relates to design alternative.It should be noted that the present invention is not limited to any specific markers correction technique.
According to one embodiment of present invention, because the audio signal by the partial decoding of h coding has been saved processing power, slowly moving or fast-forward mode is realized the processing power of the merging that partial decoding of h and markers correction audio signal are required can being less than or equal to the required processing power of decoding of realizing the audio signal of all codings in normal play mode practically.
In step 410, after the audio signal of partial decoding of h was carried out the markers correction, system carried out the audio signal of decoded image signal and markers correction synchronously, and they are play with X times of speed.Therefore, according to one embodiment of present invention, watch the user of A/V medium also will hear the audio frequency of high-quality, markers correction with F.F. or slow mode shifter, the picture signal of its sound intermediate frequency and acceleration or the broadcast of slowing down is synchronous.Yet, saved a large amount of processing powers by the audio signal of the coding of partial decoding of h only.This feasible manufacturer that plays the system of A/V medium has kept the demand of processing power, and required cost is in same levels with normal all channel, full bandwidth decoding.
C. other designs are considered
Embodiment described above use the markers correction mate normal or the part coding audio signal in order to quick or slow play.The markers correction is considered to be more suitable for than additive method, because of it has produced high-quality audio frequency output.The decoded audio signal that for example mates fast-forward play can be realized by periodically abandoning audio frame (for example only every a frame decoding audio signal).Yet, can expect that this method will cause the audio frequency of poor quality, because audio signal is not encoded in the mode that compensates such loss frame usually.In another embodiment, mating the decoded audio signal that moves broadcast slowly can realize by repeating audio frame.Yet what can expect is the audio frequency that this method will cause poor quality.In addition, as partly pointing out in the above-mentioned background technology, the broadcasting speed that improves or reduce audio-frequency unit simply will influence the tone color and the tone of audio frequency with the speed of matching image part, to make human voice have the tone of in alt similar " chipmuck ", and have the tone of similar " sleeping giant " of low pitch at slow mode shifter at fast-forward mode.
Even, then can use the markers correction algorithm of lower complexity if adopt the constraint of partial decoding of h processing power also to exist.As above carried, those skilled in the art understands a lot of different markers correction algorithms.
Most of traditional markers correction techniques use Digital Signal Processing to realize.Yet, as noted above, with reference to the embodiment of figure 3 and Fig. 4 applicable to analogue system (for example VCR) and digital system (for example DVD player) both.Therefore, when system be analogue system and when using Digital Signal Processing to realize the markers correction, supposing provided the analog to digital translation function in audio processing paths before the markers correction.For example, but the part of A/D conversion as decoding function is provided, perhaps as fully independently operation, although conceptive differing greatly.
Be applied among the embodiment of simulation signal generator in fast-forward functionality, simulated audio signal carried out digitized processing will obtain sample rate than " normal (1 times) " digital audio and video signals that speed is big.Suppose that markers correction algorithm expectation input has the digital audio and video signals of normal speed, then must change sampling rate before using the markers correction.
This can realize by many modes.In one embodiment, the A/D translation function, is used as digitized signal as the signal with normal employing speed then and is equally handled sampled audio signal with the sampling rate that increases.For example, suppose that the normal sampling rate that is used for digital audio is 48KHz, and used 2 times of fast fast-forward functionality.In one embodiment, in the A/D transition period, analog signal is carried out digitlization with the sample rate of 96KHz, but after its digitlization, audio signal is used as the signal of 48KHz and is equally handled.As a result, it will finish broadcast with 2 times time, thereby before it flows into the markers correction algorithm, be returned to normal 1 times of speed digital territory from 2 times of fast analog signals.If expect 1.5 times of speed, the 48KHz sample rate (being 72KHz) that then multiply by after 1.5 can be used for the simulated audio signal digitlization.
In an alternative embodiment, the A/D translation function is sampled with normal sample rate, then according to actual play speed, it is used as the digitized signal with different sample rates equally handles.Therefore, for example, in the A/D transition period, with analog signal in 48KHz (normal sample rate) digitlization; Then,, it is used as the 24KHz sampled signal equally handles, or, it is used as the 32KHz sampled signal equally handles for 1.5 times of fast fast-forward functionality for 2 times of fast fast-forward functionality.Slowly move for 2 times of speed, analog signal can be used as it 96KHz sampled signal and equally handle then in the 48KHz digitlization.
Below will be to being discussed further with reference to the audio-frequency processing method of describing among the embodiment among figure 3 and Fig. 4.In those embodiment, for sake of clarity, decoding function is shown as the operation that separates with the markers debugging functions.Yet in certain embodiments, these functions can be merged into a single operation.
A typical model of voice is " a speech coder model ".According to this model, the speech sound that includes vowel sound is rendered as periodic waveform in time-domain, and wherein the cycle is tone or pitch period.The inverse of pitch period is a pitch frequency.Unvoiced speech (unvoiced speech) is rendered as random noise, but is spectral shape.By making it have some frequency spectrum wave crests and trough through some filters white noise (white noise), can simulate unvoiced speech well.In addition, also have some changeover portions.
The markers correction can change the audio signal duration when preserving the local frequency content of signal.How to realize that the markers correction can adopt different technology, but as a rule, if keep tone, then the vowel waveform can not change.For example, suppose that 100 milliseconds of (ms) voice signals comprise the pitch period of 10 specific vowel sounds.If want with 2 times of these signals of fast fast-forward play, then discardable 5 pitch periods, and remaining 5 pitch periods with same period length and pitch frequency.
For unvoiced speech, this can imitatedly be the white noise through filter, and its median filter can change.Suppose and want one times of unvoiced speech speed-raising then can be become filter characteristic twice (being the time of half), and still keeps noise to excite.
In embodiment with reference to figure 3 and Fig. 4 description, the decoding of the audio signal operating procedure that correction is described as separating with markers.Yet based on former principle, these two steps can be merged into single step, and still keep the spirit and scope of the present invention.
For example, suppose that expectation adopts 2 times of fast fast-forward functionality, and the audio signal of coding is simple pulse code modulation (pcm) signal, wherein each numeral sample is represented by the code word of separate filtering.In such system, decoding and markers correction step can easily merge in the operation.For example, carry out 2 times of fast fast-forward functionality, during decoding, can skip every a sound voice cycle.If therefore the sound voice are that 8 cycles are long, during decoding, skip every one-period, will generate the acoustic voice signal of 4 cycles length and the velocity factor of twice.For unvoiced speech, can during decoding, skip the sampling of some, remainder can be connected together then.Perhaps,, can during decoding, repeat each pitch period, perhaps repeat the code snippet of sound waveform for signal is slowed down half.
Therefore, as mentioned above, according to one embodiment of present invention, the decoding of audio signal and markers correction can be merged into the single operation step.
D. conclusion
Although embodiments of the invention have been explained as above, will be understood that they only are used for illustration the present invention, and unrestricted.One skilled in the art can appreciate that in the spirit and scope that do not break away from claim of the present invention and can make various changes details described herein.Therefore, width of the present invention and scope should not limited by above-mentioned arbitrary exemplary embodiments, and should define according to claim and their equivalence.
Claims (6)
1. a method that is used to handle the audio-visual media of playing with predetermined broadcasting speed is characterized in that, comprising:
The picture signal of received code;
The audio signal of received code, the audio signal of described coding comprises the information corresponding to a plurality of voice-grade channels;
Described encoded image signal is decoded to generate decoded image signal;
The audio signal decoding of described coding to generate the audio signal of decoding, is wherein comprised the audio signal decoding of coding only corresponding to the information decoding in the audio signal of the coding of part voice-grade channel;
Audio signal to described decoding is carried out the markers correction, to generate the audio signal of markers correction; And
The audio signal of described decoded image signal and markers correction is synchronous, so that play at predetermined broadcasting speed.
2. method according to claim 1 is characterized in that, also comprises:
Receive the coded audio-picture signal that merges; And
Coded audio-the picture signal of described merging is split as the audio signal of encoded image signal and coding.
3. method according to claim 1 is characterized in that, described encoded image signal and audio signal are digital signal.
4. a method that is used to handle the audio-visual media of playing with predetermined broadcasting speed is characterized in that, comprising:
The picture signal of received code;
The audio signal of received code, the audio signal of described coding comprise the information corresponding to a plurality of frequency parts;
Described encoded image signal is decoded to generate decoded image signal;
The audio signal decoding of described coding to generate the audio signal of decoding, is wherein comprised the audio signal decoding of coding only corresponding to the information decoding in the coding audio signal of component frequency;
Audio signal to described decoding is carried out the markers correction, to generate the audio signal of markers correction; And
The audio signal of described decoded image signal and markers correction is synchronous, so that play at predetermined broadcasting speed.
5. a system that is used to handle the audio-visual media of playing with predetermined broadcasting speed is characterized in that, comprising:
The device of the picture signal of received code;
The device of the audio signal of received code, the audio signal of described coding comprises the information corresponding to a plurality of voice-grade channels;
With the device of described encoded image signal decoding with the generation decoded image signal;
With the audio signal decoding of the described coding device with the audio signal that generates decoding, wherein said audio signal decoding with coding comprises only corresponding to the device of the information decoding in the coding audio signal of part voice-grade channel with the device of the audio signal that generates decoding;
The audio signal of described decoding is carried out the device of markers correction with the audio signal of generation markers correction; And
With the audio signal of described decoded image signal and markers correction synchronously so that the device of playing at predetermined broadcasting speed.
6. a system that is used to handle the audio-visual media of playing with predetermined broadcasting speed is characterized in that, comprising:
The device of the picture signal of received code;
The device of the audio signal of received code, the audio signal of described coding comprise the information corresponding to a plurality of frequency parts;
With the device of described encoded image signal decoding with the generation decoded image signal;
With the audio signal decoding of described coding device, wherein the audio signal decoding of coding is comprised only corresponding to the device of the information decoding in the coding audio signal of component frequency with the device of the audio signal that generates decoding with the audio signal that generates decoding;
The audio signal of described decoding is carried out the device of markers correction with the audio signal of generation markers correction; And
With the audio signal of described decoded image signal and markers correction synchronously so that the device of playing at predetermined broadcasting speed.
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| TWI262718B (en) | 2006-09-21 |
| CN1700757A (en) | 2005-11-23 |
| TW200610402A (en) | 2006-03-16 |
| EP1596389A3 (en) | 2012-03-07 |
| EP1596389A2 (en) | 2005-11-16 |
| US20050254783A1 (en) | 2005-11-17 |
| US8032360B2 (en) | 2011-10-04 |
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